8 Terms
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Coal
Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams. The harder forms, such as anthracite coal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure. Coal is composed primarily of carbon along with variable quantities of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen.
Industry: Energy
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Coal
barricading
Energy; Coal
In mining, it's the process by which a wall is created, or left intact, to protect sections of the mine from gas, fire and explosions.
auxiliary operations
Energy; Coal
Any and all operations or activities that are not directly involved with mining.
auxiliary ventilation
Energy; Coal
Usually temporary ventilation that comes from redirecting the main ventilation circuit through the use of auxiliary fans and other tubes.
